This variation plays the same as traditional Solitaire.  
However you are given one additional way to make matches.  

In Doubles you can remove any matching tiles as long as they
are directly next to each other (vertically or horizontally),
regardless of whether their left or right edge is blocked by
another tile.  
DOUBLES MAHJONGG DESCRIPTION
(click to enlarge screens)
MAHJONGG LEGENDS OF THE TILES: DOUBLES
MAHJONGG FEATURES:
  • Short or extended games
  • Full customization of tiles,
    backgrounds, layouts
  • Import photos to personalize
    game environment
  • Compete for trophies and
    treasures
  • Hundreds of tile sets and
    backgrounds
  • Winning music and sound
TEN COMPLETE MAHJONGG GAMES IN ONE COLLECTION
SYSTEM REQUIREMENTS: 500 MHz Pentium Processor or
better, Windows®  2000/ ME/ XP/ Vista/ Windows 7 / 8 /
128MB RAM, DirectX compatible video /sound cards, DirectX 8.1
or higher, 100MB hard drive space, CD-ROM, Mouse.